<HTML><FONT FACE=arial,helvetica><HTML><FONT SIZE=2 PTSIZE=10 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Yes. Not like a vacuum pump would produce of course, but it is sufficient
reduction in pressure to actuate the check valve
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<BR>
MattK<BR>
<BR>
<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj:<B>Re: TT Pro 1.20 Question </B><BR>
Date:6/29/2004 7:53:20 PM Eastern Daylight Time<BR>
From:<A HREF="mailto:tph1@bellsouth.net">tph1@bellsouth.net</A><BR>
Reply-to:<A HREF="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>
To:<A HREF="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>
<I>Sent from the Internet </I><BR>
<BR>
<BR>
<BR>
Does the pump create enough of a vacuum to use a one way valve?</FONT><FONT COLOR="#000000" BACK="#ffffff" style="BACKGROUND-COLOR: #ffffff" SIZE=3 PTSIZE=12 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" BACK="#ffffff" style="BACKGROUND-COLOR: #ffffff" SIZE=2 PTSIZE=10 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">----- Original Message ----- <BR>
<B>From:</B> <A HREF="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> <BR>
<B>To:</B> <A HREF="mailto:discussion@nsrca.org">discussion@nsrca.org</A> <BR>
<B>Sent:</B> Tuesday, June 29, 2004 7:35 PM<BR>
<B>Subject:</B> Re: TT Pro 1.20 Question<BR>
<BR>
<BR>
It sounds like a pumped set-up. The tank vent should be left open during operation, to allow air to enter as the fuel is used up. The caveat is that the vent will often syphon fuel out if the vent is out in the slip stream. I use a YS check valve to allow air in but no fuel out.<BR>
<BR>
The 2 stroke 120 engine type should be able to turn a 16x10-11; 17x9-10 fairly well in the usable rpm range we need.<BR>
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Why such a large engine on such a small model?<BR>
<BR>
MattK</BLOCKQUOTE><BR>
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